Hitachi DH 38MS Technical Data And Service Manual
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Hitachi DH 38MS Technical Data And Service Manual

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PRODUCT NAME
Hitachi Rotary Hammer
DH 38MS
Model
MARKETING OBJECTIVE
The new Model DH 38MS is capable of drilling holes of up to 38 mm in diameter into concrete and is compatible
with SDS max shank tools.
APPLICATIONS
Drilling holes in concrete and drilling anchor holes.
Demolishing and chiseling concrete. Edging, gravel road digging, compacting and tamping, grooving, cutting,
stripping and roughing, etc.
SELLING POINTS
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
<New features>
Fastest drilling speed and best chiseling
performance in its class
Functional and robust design
<Same features as the conventional models>
Easy-to-operate with a double-molded side handle
Variable lock mechanism for easy working-angle
adjustment of chisels, etc.
Needle-pin type of slip clutch
International Sales Division
LIST No.
DH 38MS: H402
May 2009
D

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  • Page 1 DH 38MS Model MARKETING OBJECTIVE The new Model DH 38MS is capable of drilling holes of up to 38 mm in diameter into concrete and is compatible with SDS max shank tools. APPLICATIONS Drilling holes in concrete and drilling anchor holes.
  • Page 2 REMARKS: For more information about HANDLING INSTRUCTIONS, visit our website at: http://www.hitachi-koki.com/manual_view_export/ This TECHNICAL DATA AND SERVICE MANUAL utilizes a symbol to denote the company name and model name of our competitor. The symbol utilized herein is as follows: Competitors...

  • Page 3: Table Of Contents

    COMPARISON WITH SIMILAR PRODUCTS--------------------------------------------------------------------------- 8 1. Comparison of Specifications ------------------------------------------------------------------------------------------------------- PRECAUTIONS ON SALES PROMOTION ----------------------------------------------------------------------------- 9 1. Safety Instructions ---------------------------------------------------------------------------------------------- 9 REFERENCE MATERIALS-------------------------------------------------------------------------------------------------10 REPAIR GUIDE---------------------------------------------------------------------------------------------------------------- 11 1. Precautions on Disassembly and Reassembly --------------------------------------------------------- 11 STANDARD REPAIR TIME (UNIT) SCHEDULES--------------------------------------------------------------------17 Assembly Diagram for DH 38MS...

  • Page 4: Selling Points

    Fastest drilling speed and best chiseling performance in its class* We conducted digital engineering to determine the optimal impact specifications. As a result, the Models DH 38MS offers the fastest drilling speed and best chiseling performance in its class. *Based on our own research...
  • Page 5 12 steps by turning the grip with the change lever positioned at “Neutral.” Needle-pin type of slip clutch The Model DH 38MS is equipped with a needle-pin type of slip clutch for higher slip torque accuracy and enhanced safety (same as the Model DH 40MR).

  • Page 6: Specifications

    SPECIFICATIONS 1. Specifications Model DH 38MS Drill bit (max. dia.): 38 (1-31/64”) Capacity Core bit (max. dia.): 105 (4-9/64”) Voltage Current Power input Materials : Aluminum alloy die casting (Cylinder case, crank case, gear cover) Nylon resin Enclosure (Handle, handle cover, tail cover, crank cover)

  • Page 7: Optional Accessories

    2. Optional Accessories (1) Drilling work for through-hole drilling (rotation + impact) Drill bit (SDS max shank) D mm L mm Code No. D mm L mm Code No. 16 (5/8”) 340 (13-3/8”) 313448 16 (5/8”) 540 (21-1/4”) 313456 19 (3/4”) 340 (13-3/8”) 313449 19 (3/4”)
  • Page 8 (3) Boring work for large-diameter holes (rotation + hammering) (3) Core bit shank (Guide plate) (1) Center pin (2) Core bit (SDS max shank) (2) Core bit (1) Center pin (3) Core bit shank (SDS max) Code No. Guide plate l mm Code No.
  • Page 9 (6) Demolishing work (hammering) Bull point (SDS max shank) L mm Code No. 280 (11”) 313471 450 (15-3/4”) 313472 (7) Groove digging and edging (hammering) Cold chisel (SDS max shank) L mm Code No. 280 (11”) 313473 450 (15-3/4”) 313474 (8) Cutting and stripping (cutting asphalt etc.) (hammering) Cutter (SDS max shank) L mm...
  • Page 10 (11) Tamping work (hammering) Shank (SDS max shank) Rammer L mm Code No. l mm Code No. 150 (5-29/32”) 313478 220 (8-21/32”) 313479 (12) Syringe (for chip removal) Syringe Code No. Bellows 318085 Blow-out bulb 320859 Blow-out bulb Bellows (13) Grease 30 g (1 oz) tube 500 g (1.1 lbs.) can Code No.

  • Page 11: Comparison With Similar Products

    COMPARISON WITH SIMILAR PRODUCTS 1. Comparison of Specifications (Superior specifications: Maker HITACHI Model name DH 38MS DH 40MR Drill bit dia. (1-1/2”) (1-9/16”) (1-1/2”) Capacity Core bit dia. (4-1/8”) (4-1/8”) (3-17/32”) Power input 1,050 Full-load rotation rate 240 - 480...

  • Page 12: Precautions On Sales Promotion

    1. Safety Instructions In the interest of promoting the safest and most efficient use of the Model DH 38MS Rotary Hammer by all of our customers, it is very important that when conducting a sale that the salesperson carefully ensure that the buyer seriously recognizes the importance of Handling Instructions, and fully understands the precautions listed on the Caution Plate and Nameplate attached to each tool.

  • Page 13: Reference Materials

    The gear change section (inside the gear cover) uses Hitachi Motor Grease No. 29. The proper amount of grease is 30 g. Never use this special grease for the hammering section in the gear change section.

  • Page 14: Repair Guide

    1. Precautions on Disassembly and Reassembly The [Bold] numbers in the descriptions below correspond to item numbers in the Parts List and exploded view assembly diagram for the Model DH 38MS. Disassembly 1. Disassembly of the tool retainer While pulling the Grip [2] in the arrow direction, remove the Front Cap [1], which is fitted securely.
  • Page 15 Fig. 2 Damper [17] Damper Holder [18] Damper Washer [16] Second Hammer [15] Retainer Sleeve [12] Spring Holder (B) [20] Crank Shaft [73] Retaining Ring for D10 Shaft [72] Lock Sleeve [22] Clutch Spring [23] Cylinder Case [7] Clutch [24] Retainer Damper Washer [11] Retainer Damper [10] Striker [27]...
  • Page 16 (d) Slip Clutch Refer to the Technical Data and Service Manual for the Model DH 40MR (List No. E467) because the slip clutch mechanism is the same as that of the Model DH 40MR. Reassembly Perform reassembly by reversing the order of the disassembly procedure. However, special attention should be given to the following items.
  • Page 17 (c) Cylinder [19] and Retainer Sleeve [12] Mount the Retainer Damper Washer [11] and Retainer Damper [10] to the Retainer Sleeve [12] in this order by aligning the rounded portion of the Retainer Damper Washer [11] with the rounded portion of the Retainer Sleeve [12].

  • Page 18: Tightening Torque

    First Gear [78] side and Gear Cover [80] side in the Crank Case [70]: 30 g in total • Application of Hitachi Motor Grease No. 29 Pinion portions of the Needle Bearing M661 [79], Armature Ass'y [43] and Needle Roller D8 x 20 [13] 3.

  • Page 19: Internal Wiring

    4. Internal wiring (1) Wiring diagram for products without a noise suppressor Switch (C) (1P screw type) w/o lock Stator ass’y Armature ass’y Plug Connector or Pillar Terminal (2) Wiring diagram for products with a noise suppressor Switch (C) (1P screw type) w/o lock Stator ass’y Connector Noise...

  • Page 20: Standard Repair Time (Unit) Schedules

    STANDARD REPAIR TIME (UNIT) SCHEDULES Variable MODEL Fixed Work Flow DH 38MS Housing Ass'y Handle Cover Stator Ass'y Switch (C) Cord Gear Cover Cord Armor Needle Bearing Tail Cover Armature Ass’y Ball Bearing (6201 Crank Cover DDCMPS2L) Dust Washer Ball Bearing...
  • Page 21 LIST NO. H402 ROTARY HAMMER 2009 5 26 Model DH 38MS (E1) 100 101 DH38MS TU01680 Rev.1...
  • Page 22 PARTS DH 38MS ITEM CODE NO. DESCRIPTION REMARKS USED 331-542 FRONT CAP 331-541 GRIP 331-540 STOPPER RING 331-539 NEEDLE HOLDER 331-538 RETAINER SPRING 331-537 SPRING HOLDER (A) 331-530 CYLINDER CASE 991-712 HEX. SOCKET HD. BOLT (W/FLANGE) M6 X 25 956-996...
  • Page 23 PARTS DH 38MS ITEM CODE NO. DESCRIPTION REMARKS USED 340-753D STATOR ASS'Y 120V INCLUD. 47 340-753E STATOR ASS'Y 220V-230V INCLUD. 47 340-753H STATOR ASS'Y 220V-230V INCLUD. 47 FOR THA, INA, SIN, IND 340-753J STATOR ASS'Y 240V INCLUD. 47 340-753F STATOR ASS'Y 240V INCLUD.

  • Page 24: Standard Accessories

    PARTS DH 38MS ITEM CODE NO. DESCRIPTION REMARKS USED 608-VVM BALL BEARING 608VVC2PS2L 331-254 BEARING HOLDER 331-202 TAIL COVER 302-089 TAPPING SCREW (W/FLANGE) D5 X 20 (BLACK) 331-203 NOISE SUPPRESSOR EXCEPT FOR VEN, THA, INA, SIN, KUW, USA, CAN, MEX, IND...

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